ORIGINAL RESEARCH PATIENT SAFETY Evaluation of Lower-Dose Spiral Head CT for Detection of Intracranial Findings Causing Neurologic Deficits J.G. Fletcher, D.R. DeLone, A.L. Kotsenas, N.G. Campeau, V.T. Lehman, L. Yu, S. Leng, D.R. Holmes III, P.K. Edwards, M.P. Johnson, G.J. Michalak, R.E. Carter, and C.H. McCollough ABSTRACT BACKGROUND AND PURPOSE: Despite the frequent use of unenhanced head CT for the detection of acute neurologic deﬁcit, the radiation dose for this exam varies widely. Our aim was to evaluate the performance of lower-dose head CT for detection of intra- cranial ﬁndings resulting in acute neurologic deﬁcit. MATERIALS AND METHODS: Projection data from 83 patients undergoing unenhanced spiral head CT for suspected neurologic def- icits were collected. Cases positive for infarction, intra-axial hemorrhage, mass, or extra-axial hemorrhage required conﬁrmation by histopathology, surgery, progression of ﬁndings, or corresponding neurologic deﬁcit; cases negative for these target diagnoses required negative assessments by two neuroradiologists and a clinical neurologist. A routine dose head CT was obtained using 250 effective mAs and iterative reconstruction. Lower-dose conﬁgurations were reconstructed (25-effective mAs iterative reconstruc- tion, 50-effective mAs ﬁltered back-projection and iterative reconstruction, 100-effective mAs ﬁltered back-projection and iterative reconstruction, 200-effective mAs ﬁltered back-projection). Three neuroradiologists circled ﬁndings, indicating
American Journal of Neuroradiology – American Journal of Neuroradiology
Published: Nov 1, 2019
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